如何使用"for"循环保存/加载数据？

Question

我正在尝试使用搁置来保存/加载一些数据到文件/从文件加载一些数据。我有一个字典列表：

inv = [slot0, slot1, slot2, slot3, slot4, slot5, slot6]

7 个词典中的每一个看起来像这样，但值略有不同：

slot0 = {"item_pos": [hud_x + 592, hud_y + 4], "text_pos": [hud_x + 612, hud_y + 25], "item": None, "amount": 0}

为了保存/加载字典，我使用"搁置"模块，这是保存的代码：

with shelve.open((os.path.join(saves_path, "inventory", "inventory")), "c") as f:
f["slot0_item"] = slot0["item"]
f["slot0_amount"] = slot0["amount"]
f["slot1_item"] = slot1["item"]
f["slot1_amount"] = slot1["amount"]
f["slot2_item"] = slot2["item"]
f["slot2_amount"] = slot2["amount"]
f["slot3_item"] = slot3["item"]
f["slot3_amount"] = slot3["amount"]
f["slot4_item"] = slot4["item"]
f["slot4_amount"] = slot4["amount"]
f["slot5_item"] = slot5["item"]
f["slot5_amount"] = slot5["amount"]
f["slot6_item"] = slot6["item"]
f["slot6_amount"] = slot6["amount"]

以下是用于加载的代码：

with shelve.open((os.path.join(saves_path, "inventory", "inventory")), "c") as f:
slot0["item"] = f["slot0_item"]
slot0["amount"] = f["slot0_amount"]
slot1["item"] = f["slot1_item"]
slot1["amount"] = f["slot1_amount"]
slot2["item"] = f["slot2_item"]
slot2["amount"] = f["slot2_amount"]
slot3["item"] = f["slot3_item"]
slot3["amount"] = f["slot3_amount"]
slot4["item"] = f["slot4_item"]
slot4["amount"] = f["slot4_amount"]
slot5["item"] = f["slot5_item"]
slot5["amount"] = f["slot5_amount"]
slot6["item"] = f["slot6_item"]
slot6["amount"] = f["slot6_amount"]

虽然此代码工作正常，但它非常冗长且效率低下。我尝试使用"for"循环来保存数据，如下所示：

for slot in inv:
f["slot_item"] = slot["item"]
f["slot_amount"] = slot["amount"]

。并像这样加载数据：

for slot in inv:
slot["item"] = f["slot_item"]
slot["amount"] = f["slot_amount"]

但是，当我使用此方法时，字典在重新启动程序时不会像它们应该的那样保存/加载其更改。如何(如果可能(正确使用"for"循环来有效地保存/加载带有搁置的数据？

编辑：hud_x和hud_y都等于20

Answer 1

如果你能设法有一个字典或列表而不是slot1，slot2等代码会容易得多。

import json
from pathlib import Path
import random
# repliacting some data 
def generate_dict():
return {"item_pos": [rnd() + 592, rnd() + 4], 
"text_pos": [rnd() + 612, rnd() + 25], 
"item": None, 
"amount": 0}
def rnd():
return random.randint(0, 1000)    
# change of data structure
dict_list = [generate_dict() for id in range(7)]
# easily seriliasable into json
json_str = json.dumps(dict_list, sort_keys=True, indent=4)
# you can save json as file 
Path('store.json').write_text(json_str)
# read back
assert json.loads(Path('store.json').read_text()) == dict_list

Answer 2

我决定改用 pickle，因为它更容易与"for"循环一起使用。此外，shelve 使用类似字典的语法(pickle 没有(，所以这可能是问题的一部分。

储蓄：

with open((os.path.join(saves_path, "inventory", "inventory.txt")), "wb") as f:
for slot in inv:
pickle.dump(slot["item"], f)
pickle.dump(slot["amount"], f)

装载：

with open((os.path.join(saves_path, "inventory", "inventory.txt")), "rb") as f:
for slot in self.inventory.inv:
slot["item"] = pickle.load(f)
slot["amount"] = pickle.load(f)